Ionization-Excitation of helium-like ions by high-energy electrons


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Abstract

The differential and total cross sections are calculated for the ionization of helium-like ions that is accompanied by the excitation of residual ions to ns states owing to an electron impact. Nonrelativistic perturbation theory in electron–electron interaction with Coulomb functions used for a zero-order approximation underlies these calculations. The expressions obtained in this way have a universal character. They are applicable at moderate values of the target charge number Z and high energies of incident electrons. A comparison with total cross sections calculated for the helium atom within various theoretical approaches is performed.

About the authors

A. I. Mikhailov

Petersburg Nuclear Physics Institute

Email: anef@thd.pnpi.spb.ru
Russian Federation, Gatchina, 188300

A. V. Nefiodov

Petersburg Nuclear Physics Institute

Author for correspondence.
Email: anef@thd.pnpi.spb.ru
Russian Federation, Gatchina, 188300

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